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Finding the Fourth Proportional to 713.68, 984.85 and 418.94

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Solution

The fourth proportional to 713.68, 984.85 and 418.94 is: 578.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.68 : 984.85 = 418.94 : x
  2. Step 2: Convert to fraction form
    713.68/984.85 = 418.94/x
  3. Step 3: Cross multiply
    713.68x = 984.85 × 418.94
  4. Step 4: Simplify right side
    713.68x = 412,587.09
  5. Step 5: Solve for x
    x = 412,587.09/713.68
  6. Step 6: Final answer
    x = 578.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.